What color is #031517?

#031517 is a very dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(3, 21, 23), and in HSL hsl(186, 77%, 5%).

Is #031517 accessible as text?

On white, #031517 has a contrast ratio of 18.69:1 (passes WCAG AA for body text); on black it is 1.12:1 (fails). For text placed on #031517, use white for the best readability.

What is the closest Tailwind color to #031517?

The nearest Tailwind CSS token is neutral-900 (#171717).

What colors go well with #031517?

As a neutral, #031517 pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #031517 the same as CSS midnightblue?

No — #031517 is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#031517 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #031517

Not just a swatch — here's how #031517 works with other colors. Named schemes with #031517 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #031517 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

Jet Black opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Nordic Calm Accent · 5 colors

Accent #031517 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Jet Black keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #031517 Surface #14161A Highlight #F4F6F8 Secondary #596671 Accent #203233

Jet Black is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Jet Black.

Vintage Leather Lead · 5 colors

Lead #031517 Secondary #715017 Surface #E3DCC0 Accent #395143 Anchor #55233F

Jet Black plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #031517 Secondary #2E3435 Support #979286 Ink #16140F

Jet Black is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Jet Black carrying the quiet middle.

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Color Lab

How #031517 actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 43/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 20/100

Low

Firm and assertive — carries weight and contrast.

Depth 77/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 3/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 18/100

Very low

Clean and current — no dusty, aged cast.

Luxury 76/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 10/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 7/100

Very low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 65/100

High

Calm enough for large fills — backgrounds, cards, sections.

Print safety 93/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #031517

For UI

For branding

For interior

For fashion

People also use #031517 with

Sacramento Green Jet Black Platinum Dark Slate Gray

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 18.7:1. Use

Subtle surface Use #B4E4E9 for cards and hover fills. Tint 80

Avoid beside #030E17 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #031517 at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #031517;
  --color-base-rgb: 3 21 23;
  --color-base-oklch: oklch(18.1% 0.026 204.3);
  --color-50: #F1FDFE;
  --color-100: #DAF8FB;
  --color-200: #B7EFF5;
  --color-300: #86DFE9;
  --color-400: #59CCD9;
  --color-500: #37B1BE;
  --color-600: #318791;
  --color-700: #286066;
  --color-800: #1E3F43;
  --color-900: #142729;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F1FDFE',
    100: '#DAF8FB',
    200: '#B7EFF5',
    300: '#86DFE9',
    400: '#59CCD9',
    500: '#37B1BE',
    600: '#318791',
    700: '#286066',
    800: '#1E3F43',
    900: '#142729',
  },
}

$base: #031517;
$base-ink: #FFFFFF;
$base-50: #F1FDFE;
$base-100: #DAF8FB;
$base-200: #B7EFF5;
$base-300: #86DFE9;
$base-400: #59CCD9;
$base-500: #37B1BE;
$base-600: #318791;
$base-700: #286066;
$base-800: #1E3F43;
$base-900: #142729;
$base-hover: #021012;
$base-subtle: #8CD8E1;

{
    "color": {
        "base": {
            "value": "#031517",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FDFE",
                "type": "color"
            },
            "100": {
                "value": "#DAF8FB",
                "type": "color"
            },
            "200": {
                "value": "#B7EFF5",
                "type": "color"
            },
            "300": {
                "value": "#86DFE9",
                "type": "color"
            },
            "400": {
                "value": "#59CCD9",
                "type": "color"
            },
            "500": {
                "value": "#37B1BE",
                "type": "color"
            },
            "600": {
                "value": "#318791",
                "type": "color"
            },
            "700": {
                "value": "#286066",
                "type": "color"
            },
            "800": {
                "value": "#1E3F43",
                "type": "color"
            },
            "900": {
                "value": "#142729",
                "type": "color"
            }
        }
    }
}

Palettes built on #031517

Color Lab

Pairs with #031517

UI roles & guardrails

In real applications

Scales

Every model

Export